Apparatus for internally welding pipe joints

ABSTRACT

Method and apparatus for internally welding pipe joints together by telescopingly moving a boom mounted welding head into the interior of the pipe, and into close proximity of the area to be welded. The pipe is rotated while the adjustably fixed welding head of the apparatus applies the bead of welding. The operation is remotely controlled while visual observation of the process is attained by means of a television camera mounted in proximity of the welding head. Provision is made for positioning the welding head relative to the pipe during the welding operation, as well as maintaining an unrestricted line of view between the camera and the area being welded.

United States Patent [19] Edwards et al.

[ Oct. 9, 1973 APPARATUS FOR INTERNALLY WELDING PIPE JOINTS [73] Assignee: McVean and Barlow, Inc., Odessa,

Tex.

[22] Filed: Nov. 18, 1971 [21] Appl. No.2 200,030

[52] US. Cl. 228/4, 29/200 P, 219/59,

228/5, 228/8, 228/44 [51] Int. Cl B23k 19/00 [58] Field of Search 228/4, 5, 8, 15,

228/17, 44, 19, 20, 50; 29/33 D, 477, 477.7, 200 P, 200 J; 113/116; 17817.83; 219/59, 60

3,010,008 11/1961 I-Iandwerk et a1 219/60 R 3,020,388 2/1962 Elliot 3,424,887 1/1969 Fehlman 228/42 X FOREIGN PATENTS OR APPLICATIONS 2,067 5/1931 Australia 228/20 Primary Examiner-J. Spencer Overholser Assistant ExaminerRobert J. Craig AttorneyMarcus L. Bates [57] i ABSTRACT Method and apparatus for internally welding pipe joints together by telescopingly moving a boom mounted welding head into the interior of the pipe, and into close proximity of the area to be welded. The pipe is rotated while the adjustably fixed welding head of the apparatus applies the bead of welding. The operation is remotely controlled while visual observation of the process is attained by means of a television camera mounted in proximity of the welding head. Provision is made for positioning the welding head relative to the pipe during the welding operation, as well as maintaining an unrestricted line of view between the camera and the area being welded.

10 Claims, 14 Drawing Figures Patented Oct. 9, 1973 3,764,056

4 Shea ts-Sheet 1 COY W. EDWARDS & \AO ENOS J. LA BORDE, JR.

A BY

I L4 (LT-T15 JAIE'HS Patented Oct. 9, 1973 4 Sheets-Sheet I 60 r g 6! 59 COY W. EDWARDS 8| ENOS J. LA BORDE, JR.

M A l icuts BA1 F6 Patented Oct. 9, 1973 3,764,056

4 Sheets-Sheet 3 41 2.} up sa COY W. EDWARDS 8 ENOS J. LA BORDE, JR.

Patented Oct. 9, 1973 3,764,056

4 Sheets-Sneak 1 ENOS J. LA BORDE, JR.

APPARATUS FOR INTERNALLY WELDING PIPE JOINTS BACKGROUND OF THE INVENTION Pipe lines are fabricated from individual joints of pipe laid end to end and welded together to form a continuous fluid conduit. Each of the abutting ends of the pipes are joined together by several welding passes, that is, a technician called a welder will form a first or innermost bead by utilizing electric arc welding apparatus, whereupon a second or centrally located bead of welding will be laid down, usually by a different welder. The outermost weld is the most massive of the different passes or beads applied to the abutting pipe ends, and accordingly, requires the longest time to effect. Hence, as many as three or more welders may each run a string of welding about the outer peripheral surface of abutting end portions of pipe joints so as to securely attach adjacent joints of pipe together in a permanent manner.

It is not unusual for one out of each five welds along a limited length of a pipe line to be faulty, and accordingly, it is necessary to cut each of the unacceptable welds out of the pipe string, whereupon the pipe ends must again be beveled, and each of the three beads again formed about the adjoining ends of each joint of pipe. On the other hand, another length of the same pipe line fabrication job may enjoy several miles of pipe being welded together while experiencing little or no faulty welds. It would therefor appear that the integrity of a welded joint of pipe in a pipe line is directly proportional to the mood or temperament of the individual welders who are welding together the individual pipe joints.

In order to remove much of the human element from the job of joining pipe joints together by electric welding, it is possible to resort to the use of automatic welding equipment which includes the submerged arc process of welding; however, this process is generally restricted to forming double joints of pipe, which are subsequently joined together in the before described manner. Furthermore, the submerged arc process leaves an undesirable interface on the inside peripheral wall surface between adjacent joints of pipe. It is for this reason that the innermost bead of weld must be effected interiorly of the pipe and is usually the last bead to be formed when the submerged arc process is used.

In fabricating double jointed pipe of a diameter which admits a humans body thereinto, a technician can enter the pipe and visually observe and control a submerged arc welding apparatus as it lays down the third and innermost bead of weld. However, where the pipe is of a diameter smaller than the human body, such an expedient is impossible; and, accordingly, other techniques must be employed in order to be able to visually observe the innermost weld as it is being formed, and to be able to control the various parameters associated with the welding process from a remote location. Attainment of these desirable expedients requires that the welding process be controlled and visually observed from a location which is remote with respect to the interior of the pipe.

SUMMARY OF THE INVENTION This invention comprehends both method and apparatus for internally welding together pipe joints, and especially welding a bead utilizing the submerged arc process. The invention comprises adjustably mounting a welding head onto the free depending end of a boom and telescopingly moving the boom along with the welding head into the interior of the pipe and into close proximity of the interface formed between adjacent joints of pipe. Means for moving the head relative to the boom are provided so as to enable the bead to be laid down at the exact desired location on the pipe interior. Visual observation of the process is made possible by a television camera which is mounted to the head and focused on the weld as it is being formed. A television receiver is remotely positioned relative to the interior of the pipe, along with the necessary controls for carrying out the welding process, which enables an operator to visually monitor and control the formation of the weld.

Therefore, a primary object of this invention is the provision of a method by which the interior of a pipe can be welded while the welding operation is controlled from a location remote from the interior of the pipe.

Another object of the invention is to provide a means by which a remote controlled submerged arc process can be employed to effect a weld on the interior of a pipe.

A further object of this invention lies in the provision of a method of joining together joints of pipe by the submerged arc welding process wherein means are provided for viewing the process while the welding operation is controlled from a location remote from the inte rior of the pipe.

A still further object of this invention is to provide apparatus for welding the interior of a pipe wherein the apparatus is telescopingly received within the pipe, and the welding operation remotely controlled.

Another and still further object of this invention is to provide apparatus for carrying out the submerged arc process on the interior surface of a pipe by remote control means.

An additional object of this invention is to provide a method for carrying'out the submerged arc process on the interior surface ofa pipe by remote control means.

Another object is to provide remote control means by which a welding head can be controllably indexed relative to the interface formed between adjacent joints of pipe.

These and various other objects and advantages of the invention will become readily apparent to those skilled in the art upon reading the following detailed description and claims and by referring to the accompanying drawings.

The above objects are attained in accordance with the present invention by the provision of a method of internally welding pipe that is used with apparatus fabricated in a manner substantially as described in the above abstract and summary.

BRIEF DESCRIPTION OF THE EMBODIMENTS FIG. 1 is a diagrammatical representation in the form of a flow sheet which sets forth a welding process which is carried out in accordance with the present invention;

FIG. 2 diagrammatically sets forth a side elevational view of one form of the apparatus for carrying out the present invention;

FIG. 3 is an enlarged fragmentary part diagrammatical, side elevational view of apparatus made in accordance with the present invention;

FIG. 4 is an end view of the apparatus disclosed in FIG. 3;

FIG. 5 is an enlarged cross-sectional view taken along line 55 of FIG. 2;

FIG. 6 is an enlarged, broken, top plan view of apparatus made in accordance with the present invention;

FIG. 7 is an enlarged part cross-sectional, side elevational view of the apparatus disclosed in FIG. 6;

FIG. 8 is a side-elevational view of part of the apparatus disclosed in FIG. 6;

FIG. 9 is a fragmentary representation which sets forth part of the apparatus disclosed in FIG. 6;

FIG. 10 is an enlarged bottom view of the apparatus disclosed in FIG. 6;

FIG. 1 1 is a diagrammatical representation of part of the apparatus used in carrying out the present invention;

FIG. 12 is a fragmentary, bottom view of part of the apparatus disclosed in FIG. 10;

FIG. 13 is an enlarged, fragmentary, part crosssectional representation of part of the apparatus disclosed in FIG. 6; and

FIG. 14 is a part cross-sectional view which discloses an important feature of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Throughout the figures of the drawings, wherever possible, like or similar numerals will refer to like or similar elements.

In FIG. 1 a railroad track 10 lays adjacent to the spaced apart pipe racks 11 and 12, which in turn are positioned in close proximity to the spaced apart pipe racks l3 and 14. Joints of pipe 15 may be transferred from railroad cars (not shown) onto the pipe racks in a convenient and conventional manner. station 16, the details of which are not essential to the invention and which can take on several different forms, receives pairs of lengths of pipe 15 adjacent thereto so that the adjacent ends thereof may be cleaned, ground to a bevel, and transferred into a position generally illustrated by the arrow at numerals l7 and 18.

Pipe racks 19 and 20 are spaced apart from a submerged arc welding apparatus 21, the details of which are known to those skilled in the art. The apparatus receives the joints of pipe with the aid of alignment apparatus 22 and 23 which pushes the joints of pipe into an axially aligned and abutting configuration. A bead of weld is applied about the rotating pipe at the abutting interface thereof to form a double jointed pipe. The double jointed pipe is positioned at 24, where the pipe then moves into proximity of the next submerged arc welding apparatus 25, whereupon an outermost bead of welding is applied to the innerface of the fixed rotating pipe.

The double jointed pipe is next positioned in a location as indicated by the numeral 26, where the pipe awaits the final welding operation which is comprised of effecting an internal weld about the inside peripheral surface of the rotating pipe at the interface thereof. Pipe racks 27 and 28 receive the double jointed pipe 29 from area 26, and after the pipe 29 has been provided with the inside string or bead of welding, the finished pipe is X-rayed at 30 and suitably stored at 31 for subsequent use. The entire process has therefore been used to advantage to completely weld together individual joints of pipe into a double jointed pipe, with the entire welding procedures being semi-automatically called out by the submerged arc welding process.

The step of forming the before mentioned inside bead of welding is carried out by the provision of a track 32 upon which a cart 33 is movably mounted, with the cart being adapted to move along the track, carrying therewith an elongated cantilever boom 34. At the free end of the boom there is mounted a welding head 35, with the head and marginal end portion of the cantilever boom being slidably received in a telescoping manner into end 36 of pipe 29, to thereby gain access to the interior of the pipe so as to enable a weld to be formed in the inside peripheral surface of the pipe at the interface 37 which connects together the double jointed pipe. Station 38 represents a convenient area for a workman to monitor and service the boom and welding head, while station 39 represents an area where the entire operation of the apparatus, including the boom mounted head, is remotely controlled and supervised.

In FIG. 2, in conjunction with FIGS. 3-5, the cantilever boom is seen to be supported by a hydraulically actuated roller assembly 140 which supports a midportion of the boom and at the same time controls the elevation of the boom and welding head relative to the pipe. The welding head is seen to be attached to a member 40 which provides means by which the head can be supported by and moved longitudinally and laterally of the interior surface of the pipe. Cylinder 41 retracts and extends a pair of journaled rubber tires 42 while the journaled rubber tires 43 are permanently mounted in fixed relationship relative to the head. Numeral 44 indicates circumferentially extending indicia, as for example chalk marks, placed on either side of the interface 37 so as to provide markers for a purpose which will be more fully discussed later on.

Nozzle 45 is controllably connected to a remote supply of high pressure air, and is spaced apart from illuminating means 46, with the illuminating means and the nozzle being directed towards and underlying the lense of camera 47. Electrode holder 48 is aligned with indexing means 49, while numeral 50 broadly indicates the various mechanism associated with the automatic submerged arc welding process. Numeral generally indicates means which adjustably amount the head to the boom, so as to enable the head to be positioned longitudinally relative to the boom when exacting smaller relative motion thereof is required.

Looking now to the details of FIG. 6, in conjunction with some of the remaining figures, a flux hopper 50 is provided with a hopper door 51, and generally occupies the available space adjacent to motor 52 of a gear box case 53 of an automatic welding apparatus, as far example, a Lincoln welder, capable of delivering 700 amps. Angle bracket 54, which carries the entire weight of the head, is bolted to the before mentioned case while feed mechanism 55 is likewise bolted to the case. The welding rod is in the form of a wire which is fed through a ceramic insulator 55' in a manner known to those skilled in the art.

Spaced apart vertical plate members 56 and 57 are tied together by the illustrated spaced apart parallel polished rods 58, 58. The rods are slidably received within fixed bushings 59, 59' with the bushings being welded to a horizontal plate member 60. The plate member 60 carries the entire load presented by the spaced apart plates 56, 57.

Spaced apart fixed journal means 61, 62 rotatably receive jack screw 63 therein, with a marginal length of the midportion of the jack screw threadedly receiving follower 64 thereon. The follower is rigidly affixed to the before mentioned plate 57 so that the plate must move therewith as the jack screw rotates.

Cantilever mount 65 supports horizontal plate 60 and motor 66, with the motor having a drive sprocket 67 engaged by a standard chain, and with the chain being meshed to a driven sprocket 68. The drivensprocket is affixed to a marginal end portion of the jack screw.

As seen in FIG. 7, the cantilever mount 65 is rigidly welded to a vertical plate 69 which in turn is bolted to and forms welded to a vertical plate 69 which in turn is bolted to and forms part of the free depending end of the boom.

Hydraulically actuated cylinder 70 has a piston reciprocatingly received therein, with the usual piston rod 71 having a depending end portion suitably journaled to plate member 72. Plate member 72 has the illustrated upwardly depending arm which is journaled to a pair of spaced apart webs 73, so as to enable the journaled rubber wheels 74 to be pivoted from a retracted into an extended position, and vise versa. Laterally positioned with respect to wheels 74 is another set of wheels 75, each of which are rotatably mounted to a yoke. with the yoke being rigidly affixed to frame member 76. Frame member 76 ties together the inclined plate member 77 and the vertically disposed plate member 78.

Looking now to the details of FIG. 10, in conjunction with the remaining figures, an incandescent light 79 provides illumination for the general area whic is exposed to view of the camera lens. Air nozzle 80 is gen erally directed in a direction towards a rearward position relative to the bead which is being laid down or formed by electrode assembly 49. A second incandescent light 81 also is directed in the same general area as the light 79.

Web 82 is attached to the vertical plate 65 and to a portion of a cantilever type mount 83. It will be noted that the spaced apart plates 56, 57, and 69 are vertically disposed and arranged parallel to one another, and are of a size which permits entry into the interior of the pipe.

Looking now to the details of FIG. 13, in conjunction with some of the remaining figures, the camera 47 is seen to have a plurality of downwardly depending legs attached thereto, one of which is seen at 85, with the leg supporting a ring 86, and with the ring being axially aligned with the camera lens at 48. A free end portion of pointer 87 is seen depending from the ring. The pointer forms indexing means by which the electrode 90 can be aligned with a welding bead as the bead is being formed at the interface of the double jointed pipe.

Flux from the hopper is metered through the annular area 88 formed by cylindrical skirt member 89 and the welding rod 91. Ceramic insulator 90 has the illustrated welding rod fed therethrough, with the flux surrounding the rod and becoming molten as seen at 92. The beam 93 is covered with flux as indicated by the numeral 94 as is appreciated by those skilled in the art.

Bracket 95 supports a downwardly extending insulating curtain 96 to thereby shield the camera from the radiant energy produced by the arc welding process. Television receiver 97 is electrically connected to the camera 47 and includes a screen 98 having the illustrated image formed thereon during the welding process. The before mentioned spaced apart chalk lines are seen at 99, 101 while an image of the bead appears as indicated by numeral 100. An image of the pointer is seen at 87'.

In operation, the double jointed pipe 29 is positioned in the illustrated manner of FIG. 1, and the welding head is telescopingly placed within the pipe and run into close proximity ofinterface 37 by means of a motor driven trolley 33. The operator, seated at 39, for example, views screen 98 and as the welding head approaches the interface, an image of the chalk marks 44 appears upon the screen. Without the chalk marks, extreme difficulty would be experienced in locating the interface. As the arrow comes into close proximity of the interface, final small adjustments are made by utilizing the jack screw so as to attain exact alignment along the interface. The submerged arc welding apparatus is next remotely energized by the operator. As flux flows down annulus 88 and covers the moltent metal in the illustrated manner of FIG. 13, the operator, who is remotely positioned from the interior of the pipe, monitors the welding operation and continues to maintain arrow 87 aligned with image 100.

The relationship of rod 91 to the interface is remotely controlled by actuating motor 66 so as to cause the rotatable jack screw to move the follower longitudinally of the boom which in turn moves plate 56, thereby moving the entire welding head longitudinally of the pipe and interface to be maintained. The jack screw is used for small or fine adjustments in the welding head while the trolley is used for much larger, or course movement of the head. Since arrow 87 is arranged in spaced apart relationship relative to electrode 91 and to the travel of the inside peripheral surface of the pipe, the bead is exactly superimposed upon the interface so long as image 87 is maintained superimposed over image 100.

Should debris such as flux fall between the camera lens and the bead, the operator actuates a remote controlled solenoid valve so as to cause air from the nozzle to blow the debris downstream of the weld.

It is necessary to remove the initial flux 104 from the bead and to overlap the beginning and end of 'the circumferentially extending bead approximately one-half inch so as to provide an acceptable weld. For this reason it is necesary to remove the flux 104, which, as it cools, will usually tend to curve away from the pipe wall as illustrated in FIG. 14. It is necessary, however, to occasionally impact or jar" the interface of the double jointed pipe so as to facilitate this removal, and, for this purpose, structure 102 has affixed thereto an impact hammer 103 which im-pacts against the outer peripheral wall surface of the pipe 29 to thereby jar the flux loose. Journal means 105 enables arm 106 to pivot the mechanism free of the direction of travel of the pipe so that the pipe can be rolled into position 30 after the weld is completed. Accordingly, the apparatus of FIG. 14 provides means for impacting the area of the pipe where the bead has been formed to thereby loosen flux from the bead.

The welding leads, power source, air source, camera hoop-up wires, and welding wire are all brought from the head, along the boom, and to the trolley, where they continue on to their proper destination. The details of this aspect of the invention can take on a number of different forms and is considered to-be within the comprehension of those skilled in the art.

I claim: 7

1. Apparatus for effecting an internally welded interconnection between rotating pipe joints comprising: a longitudinally extending boom; means for moving said boom in a direction longitudinally of its length; a welding head; means movably mounting said welding head to a free end of said boom so as to enable the head to be moved in a longitudinal direction relative to the boom; said head and a marginal length of said boom having a configuration which enables it to be telescopingly received within the pipe to be internally welded;

means for remotely controlling the action of the welding head as it forms a bead within the pipe;

means for remotely controlling said means movably mounting said head to said boom;

a television camera, means mounting said camera to said head so that the camera can transmit an image representative of the area being welded; and, a remotely located television receiver means electronically connected to said camera for producing said image;

an index means located in the field of vision of said camera which enables visual observation of the relative position of the welding head with respect to the bead being formed on the interior of the pipe.

2. The apparatus of claim 1 wherein there is further included means for impacting the area of the pipe where the bead has been formed to thereby loosen flux from the bead.

3. The apparatus of claim 1 and further including means for removing debris from the area of the pipe being viewed.

4. The apparatusof claim 1 wherein said means adjustably mounting said head to the free end of said boom includes a jack screw, a follower, linkage means connecting said head to said follower, and remote control means for rotating said jack screw in a counterclockwise or clockwise rotational direction so that said follower is moved along the jack screw carrying the head therewith.

5. The apparatus of claim 1 wherein said means for moving said boom in a direction longitudinally of its length includes a track mounted cart affixed to the end of the boom which extends away from the pipe when the remaining end of the boom is telescoped into the pipe; said cart being remotely controlled and movable along the track carrying the boom therewith.

6 The apparatus of claim 1 wherein said index means includes a pointer interposed between the camera lens and the wall at a position respective to the welding head which is aligned laterally with respect to the welding electrode so that when the pointer is aligned with the interconnection between the pipe sections, the electrode will be interposed over the interconnection.

7, The apparatus of claim 6 wherein said pointer is is normally aligned with the bead formed at the interconnection between the pipe joints while the welding head is positioned in advance of the pointer.

8. An internal non-rotating pipe welding apparatus for internally welding together adjacent pipe joints while the pipes are rotated about their longitudinal axis comprising:

a longitudinally extending boom; means for moving said boom in a direction longitudinally of its length; a welding head; means movably mounting said welding head to a free end of said boom so as to enable the head to be moved in a longitudinal direction relative to the boom; said head and a marginal length of said boom having a configuration which enables it to be telescopingly received within the pipe to be internally welded;

means for remotely controlling the action of the welding head as it forms a bead within the pipe; means for remotely controlling said means movably mounting said head to said boom;

means for enabling remote visual observation of the relative position of the welding head and the interface between the pipe joints, so-that the location and action of the welding head can be controlled to cause the bead to be properly formed on the P p the last said means including a television camera mounted to said head, said television camera having a lens positioned to transmit an image representative of the bead adjacent to the area being welded by the welding head, a remotely located television receiver means connected to said camera for producing said image;

a pointer fixed in position relative to said welding head, said pointer being spaced behind said welding head and positioned in aligned relationship with respect to the interface of the adjacent pipe joints so that the image of the pointer and its relative location respective to the interface can be used to control the position of the bead.

9. The apparatus of claim 8 wherein said means adjustably mounting said head to the free end of said boom includes a jack screw, a follower, linkage means connecting said head to said follower, and remote control means for rotating said jack screw in a counterclockwise or clockwise rotational direction so that said follower is moved along the jack screw carrying the head therewith.

10. The apparatus of claim 8 wherein there is further included means for impacting the area of the pipe where the bead has been formed to thereby loosen flux from the bead;

and further including means for removing debris from the area of the pipe being viewed. 

1. Apparatus for effecting an internally welded interconnection between rotating pipe joints comprising: a longitudinally extending boom; means for moving said boom in a direction longitudinally of its length; a welding head; means movably mounting said welding head to a free end of said boom so as to enable the head to be moved in a longitudinal direction relative to the boom; said head and a marginal length of said boom having a configuration which enables it to be telescopingly received within the pipe to be internally welded; means for remotely controlling the action of the welding head as it forms a bead within the pipe; means for remotely controlling said means movably mounting said head to said boom; a television camera, means mounting said camera to said head so that the camera can transmit an image representative of the area being welded; and, a remotely located television receiver means electronically connected to said camera for producing said image; an index means located in the field of vision of said camera which enables visual observation of the relative position of the welding head with respect to the bead being formed on the interior of the pipe.
 2. The apparatus of claim 1 wherein there is further included means for impacting the area of the pipe where the bead has been formed to thereby loosen flux from the bead.
 3. The apparatus of claim 1 and further including means for removing debris from the area of the pipe being viewed.
 4. The apparatus of claim 1 wherein said means adjustably mounting said head to the free end of said boom includes a jack screw, a follower, linkage means connecting said head to said follower, and remote control means for rotating said jack screw in a counter-clockwise or clockwise rotational direction so that said follower is moved along the jack screw carrying the head therewith.
 5. The apparatus of claim 1 wherein said means for moving said boom in a direction longitudinally of its length includes a track mounted cart affixed to the end of the boom which extends away from the pipe when the remaining end of the boom is telescoped into the pipe; said cart being remotely controlled and movable along the track carrying the boom therewith.
 6. The apparatus of claim 1 wherein said index means includes a pointer interposed between The camera lens and the wall at a position respective to the welding head which is aligned laterally with respect to the welding electrode so that when the pointer is aligned with the interconnection between the pipe sections, the electrode will be interposed over the interconnection.
 7. The apparatus of claim 6 wherein said pointer is superimposed over the pipe wall at a location spaced from and behind the welding head so that the pointer is normally aligned with the bead formed at the interconnection between the pipe joints while the welding head is positioned in advance of the pointer.
 8. An internal non-rotating pipe welding apparatus for internally welding together adjacent pipe joints while the pipes are rotated about their longitudinal axis comprising: a longitudinally extending boom; means for moving said boom in a direction longitudinally of its length; a welding head; means movably mounting said welding head to a free end of said boom so as to enable the head to be moved in a longitudinal direction relative to the boom; said head and a marginal length of said boom having a configuration which enables it to be telescopingly received within the pipe to be internally welded; means for remotely controlling the action of the welding head as it forms a bead within the pipe; means for remotely controlling said means movably mounting said head to said boom; means for enabling remote visual observation of the relative position of the welding head and the interface between the pipe joints, so that the location and action of the welding head can be controlled to cause the bead to be properly formed on the pipe; the last said means including a television camera mounted to said head, said television camera having a lens positioned to transmit an image representative of the bead adjacent to the area being welded by the welding head, a remotely located television receiver means connected to said camera for producing said image; a pointer fixed in position relative to said welding head, said pointer being spaced behind said welding head and positioned in aligned relationship with respect to the interface of the adjacent pipe joints so that the image of the pointer and its relative location respective to the interface can be used to control the position of the bead.
 9. The apparatus of claim 8 wherein said means adjustably mounting said head to the free end of said boom includes a jack screw, a follower, linkage means connecting said head to said follower, and remote control means for rotating said jack screw in a counter-clockwise or clockwise rotational direction so that said follower is moved along the jack screw carrying the head therewith.
 10. The apparatus of claim 8 wherein there is further included means for impacting the area of the pipe where the bead has been formed to thereby loosen flux from the bead; and further including means for removing debris from the area of the pipe being viewed. 